How To Do Yaml.safe_dump() And .safe_load() Of Python Object Without Yaml.yamlobject?

I want to serialize some object with yaml.safe_dump(). How can I serialize Python objects with add_representer() and add_constructor() ... I can not add yaml.YAMLObject to Thing (t

Solution 1:

You cannot construct Thing() without handing in the name. You can solve that in various ways, but the following should work.

def thing_constructor(self, node):
    name = None
    for x in node.value:
        if x[0].value == 'name':
            name = x[1].value
    return Thing(name)


yaml.SafeLoader.add_constructor('!Thing', thing_constructor)

res = yaml.safe_load(safe_dump)
print res.name

You can simplify the setting of the name parameter, but this way it is more extensible if Thing would have taken more parameters.